Author name: Engr. Aneel Kumar

OPERATING PRINCIPLE OF A GATE TURNOFF THYRISTOR GTO

GTO being a monolithic p-n-p-n structure just like a thryistor its basic operating principle can be explained in a manner similar to that of a thyristor. In particular, the p-n-p-n structure of a GTO can be though of consisting of one p-n-p and one n-p-n transistor connected in the regenerative configuration as shown in Figure. […]

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THE NEED FOR SWITCHING IN POWER ELECTRONIC CIRCUITS

The heart of any power electronic circuit is its semiconductor-switching network. The question arises here as to whether we have to use switches to perform electrical power conversion from the source to the load. The answer, of course, is no, as there are many circuits that can perform energy conversion without switches, including linear regulators

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POWER QUALITY PROBLEMS IEEE

IEEE defined power quality disturbances into seven categories based on wave shape: 1. Transients 2. Interruptions 3. Sag/ Under voltage 4. Swell/ Overvoltage 5. Waveform distortion 6. Voltage fluctuations 7. Frequency variations 1. TRANSIENTS Potentially the most damaging type of power disturbance, transients fall into two subcategories: 1. Impulsive 2. Oscillatory more » 2. INTERRUPTIONS

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WHAT IS GROUNDING

There are several important reasons why a grounding system should be installed. But the most important reason is to protect people! Secondary reasons include protection of structures and equipment from unintentional contact with energized electrical lines. The grounding system must ensure maximum safety from electrical system faults and lightning. A good grounding system must receive

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TYPES OF SUBSYNCHRONOUS RESONANCE INTERACTIONS

There are several ways in which the system and the generator may interact with subsynchronous effects. A few of these interactions are basic in concept and have been given special names. We mention three of these that are of particular interest: Induction generator effect Torsional interaction Transient torque Each of the above effects will be

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